When is the last frost in Costilla, NM?

For ZIP code 87524, the average last spring frost (32°F) is June 19, based on NOAA 1991-2020 climate normals for the Red River, NM weather station. There is a 1-in-10 chance of a frost after July 3.

When is the first frost in Costilla, NM?

The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 17, so tender plants are at risk from that point on.

How long is the growing season in 87524?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 77 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 87524Costilla, NM

The average last spring frost in Costilla is June 19 and the average first fall frost is September 7, giving a typical growing season of about 77 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 19
Average first fall frost: Sep 7
Growing season: 77 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	—	—	40 days	100%
Frost / freeze (32°F)	Jun 5 · Jun 19 · Jul 3	Aug 17 · Sep 7 · Sep 18	77 days	100%
Hard freeze (28°F)	May 20 · Jun 2 · Jun 16	Sep 6 · Sep 20 · Oct 1	108 days	100%

Where these dates come from

ZIP code 87524 is matched to the NOAA station Red River, NM, 33.6 km away, at 8,667 ft elevation (552 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Red River, NM (used)	8,667 ft	Jun 19	Sep 7
Cerro, NM	7,650 ft	May 31	Sep 26
Manassa, CO	7,695 ft	May 28	Sep 21
San Luis 1 S, CO	7,943 ft	May 31	Sep 23

Frost dates near Costilla

Jaroso, CO 81138 · last May 31, first Sep 26
Amalia, NM 87512 · last May 31, first Sep 23
Cerro, NM 87519 · last May 31, first Sep 26
San Luis, CO 81152 · last May 31, first Sep 23
Questa, NM 87556 · last May 31, first Sep 26
Red River, NM 87558 · last Jun 19, first Sep 7
Manassa, CO 81141 · last May 28, first Sep 21
San Cristobal, NM 87564 · last May 31, first Sep 26

Frequently asked questions

When is the last frost in Costilla, NM?: For ZIP code 87524, the average last spring frost (32°F) is June 19, based on NOAA 1991-2020 climate normals for the Red River, NM weather station. There is a 1-in-10 chance of a frost after July 3.
When is the first frost in Costilla, NM?: The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 17, so tender plants are at risk from that point on.
How long is the growing season in 87524?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 77 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.